This is where the harmonic balancer comes in. The circular device, made of rubber and metal, is bolted at the front end of the crankshaft to help absorb vibrations. It's usually connected to the crank pulley, which drives accessories like the air conditioner.
Additional costs: Ground water wells can also be tested for radon, then, if needed, can get a water radon mitigation system installed. Installing a water radon mitigation system runs from $1,000-$4,500, and maintenance runs $0 to $150 annually.
The average radon mitigation system is installed for under $1,500. Some homes require multiple mitigation techniques and /or systems, so the costs can vary. In new homes, the cost to install a passive system is less since the system is installed during construction.